Ineffective when using page caching - ajax solution?

Alright this bugged me enough to roll my own solution so here it is.
Apologies for no patch file, but the additions to the module are so minor it should be easy to do.

First up, add this snippet to the ip2cc_menu() function in the module. It sets up a menu callback that allows us to call ip2cc using the path "http://www.yoursite.com/ip2cc_get_country_js". It won't appear a menu anywhere - its just drupal's way of allowing you to map a custom URL to a php callback.

if ($may_cache) {

    //.... other stuff ....

    $items[] = array(
      'path' => 'ip2cc_get_country_js',
      'title' => t('Get Country as JSON'),
      'callback' => 'ip2cc_get_country_js',
      'access' => user_access('access content'),
      'type' => MENU_CALLBACK
    );
}

Now add the callback function we defined above elsewhere in the module. The function returns the whole $country object as a json string, which can later be converted to a javascript object on the client.

function ip2cc_get_country_js() {
  $country = ip2cc_get_country($_SERVER['REMOTE_ADDR']);
  print drupal_to_js($country);
  exit;
}

So now if you want to call this callback using ajax on your page or block its quite simple. This is part of a bit of php I have inserted into a block. My block displays two tabs, and I want one of them initially selected for US visitors, and the other for everyone else:

$inline_js = '$(document).ready(' .
  'function() { ' .
    '$.get("ip2cc_get_country_js", function(json) { ' .
      'var ip2cc_country = eval("(" + json + ")"); ' .
      'if (ip2cc_country.country_code != "US") {}; // <-- do something here ' .
    '} );' .
  '});';
drupal_add_js($inline_js, 'inline', 'header', false, true);

What it does is calls that callback function we added to the module via ajax when the page loads and the callback returns a json string, which we then eval() into a javascript object. Works like a charm.

I highly recommend that this is added to the module code.